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I have a 5 gallon hex tank that I have used in the past to artifically hatch angelfish eggs and raise angelfish in. I was wanting to set this up full time so it would be ready to use whenever my angels spawned. I wasnt sure how to go about keeping the tank cycled to prevent ammonia spikes. I was going to use a sponge filter with an aerator. I have a cylinder sponge that is in my 100 gallon tank that im sure has beneficial bacteria in it so i was thinking I could use this. Is there anything else i need to do to set this tank up? I know i need a heater but am i missing something? Does it need small fish to keep it cycled?